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JOINT VENTURES - Ares (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2018 USD ($) MW MMcf	Mar. 31, 2018 USD ($) shares	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)
JOINT VENTURES
Net proceeds received by CRC from the transaction			$ 796	$ 98
Ares JV
JOINT VENTURES
Net proceeds received by CRC from the transaction	$ 750
Joint venture transaction cost	$ 3
Ares JV | Ares-led investor group
JOINT VENTURES
CRC shares issued to Ares-led investor group in a private placement | shares		2.3	2.3
Purchase price of the CRC shares issued to Ares-led investor group in a private placement		$ 50
Class A common interest | Ares JV
JOINT VENTURES
Period in which monthly distributions can be deferred	3 years
Natural gas power and Gas processing plants | Ares JV
JOINT VENTURES
Power plant capacity | MW	550
Gas processing plant capacity | MMcf	200
ECR Corporate Holdings L.P. | Class A common interest | Ares JV
JOINT VENTURES
Percentage of common interest held by ECR	50.00%
ECR Corporate Holdings L.P. | Class B preferred interest | Ares JV
JOINT VENTURES
Percentage of common interest held by ECR	100.00%
ECR Corporate Holdings L.P. | Class C common interest | Ares JV
JOINT VENTURES
Percentage of common interest held by ECR	4.75%
ECR | Redemption prior to fifth year
JOINT VENTURES
Redemption period	5 years
ECR | Redemption prior to fifth year | Class A common interest
JOINT VENTURES
Redemption price	$ 60
ECR | Redemption prior to fifth year | Class B preferred interest
JOINT VENTURES
Redemption price	$ 750
ECR | Redemption prior to seven and a half years
JOINT VENTURES
Maximum extension period of redemption	2 years 6 months
Make-whole payment redemption period	7 years 6 months
ECR | Redemption prior to seven and a half years | Class A common interest
JOINT VENTURES
Redemption price	$ 80
ECR | Redemption prior to seven and a half years | Class B preferred interest
JOINT VENTURES
Redemption price	$ 750
Ares JV | Class A common interest
JOINT VENTURES
Percentage of common interest held by CRC	50.00%
Ares JV | Class C common interest
JOINT VENTURES
Percentage of common interest held by CRC	95.25%

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